It also installs the README file, and builds and installs PDF documentation. The PDF documentation includes critical information the manpages leave out, including some of the column meanings. Sadly, the PDF documentation does not show it has been updated since 2008, so is a bit outdated, but much of it is still relevant.

(NOTE the comments here have an unintended feature/bug, so the index line has the first git commit f92.. replaced with a link to a non-existing commit id on this repo. It's also putting < and > around part of source.)